Mass spectrometer



FIG. 1 is a perspective view of a mass spectrometer.

FIG. 2 is a perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a top plan view thereof.

FIG. 6 is a bottom plan view thereof.

FIG. 7 is a right side elevation view thereof; and,

FIG. 8 is a left side elevation view thereof.

The portion of the article shown in broken lines is for illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a mass spectrometer, as shown and described. 